Manufacture of incandescent electric lamps



(No Model.)

2 Sheets-Sheet 1. 0. A. MOSES.

MANUFACTURE OF INGANDESGENT ELECTRIC LAMPS;

Patented May 22, 1888.

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2 SheetsSheet 2.v

(No Model.)

0. A. MOSES.

MANUFACTURE OF INGANDESGENT ELECTRIC LAMPS. N0. 383,140.

Patented May 22, 1888.

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N. PETERS. Phuw'Lithoflnpher, Walhir-gmn, I]. C.

OTTO A. MQSES, OF NEV YORK, N.

PATENT OFFICE.

, ASSIGNOR TO THE WESTINGHOUSE ELECTRIC COMPANY, OF PITTSBURG, PENNSYLVANIA.

MANUFACTURE OF INCANDESDENT ELECTRIC LAMPS.

SPECIFICATION forming part of Letters Patent fie. 383,140, dated May 2 1838b Application filed December 29, 1686.

To all whom it may concern.-

Be it known that I, OTTO A. MOSES, a citizen of the United States, residing in New York, 1n the county and State of New York, have nvented certain new and useful Improvements in the Manufacture of Incandescent Electric Lamps, ofwhich the following is a specification.

The invention relates to the construction of the globes of incandescent electric lamps and to the means of attaching the same to a holder and securing electrical connections between the leading-in wires of the filament and the conductors of the holder.

It is well known that in certain instances an objection to incandescent electric lamps of the nsual construction lies in the fact that the light is too concentrated, and various means have been employed for diffusing the light-such, for lnstance, as the employment of groundglass globes,or cutglass globes, or globes made of more or less opaque material. The cut-glass globes afford results more satisfactory than most forms; but the expense incident thereto is a serious objection to their general intro duction. By the present invention it is pro posed to provide a blown-glass globe having the advantages incident to the cut glass form, and this feature of the invention consists in causing the walls of the globe to be corrugated or in the form of annular rings and depressions, which serves to diffuse the light given off by the filament. It is necessary in the manufacture of incandescent lamps that the glass bulbs f1 cm which they are made should be of uniform thickness, and also that there should be no vertical lines or seams in the globe. For this reason it is impracticable to cast the globe in a mold or to cause it to conform to the shape of a mold while stationary. By this invention it is proposed to shape the globe in a mold having its inner surface properly conformed, and while the glass is still malleable the globe is turned within the mold axially, so that no seams are formed upon it, and thus the liability ofits cracking along such portions is avoided.

The neck of the globe is preferably provided with a screw-thread, which forms a convenient method of attaching the lamp to a correspond- 50 ing end piece or socket. There is preferably inserted in the neck of the globe, after the fila ment has been inserted and the portion hold ing the same has been properly sealed, a block containing the contact-points which serve to continue the connections to the holder proper.

The invention will be described in detail in connection with the accompanying drawings, in which Figure 1 is an elevation of the complcted lamp, and Fig. 2 is a crosssection of the end containing the block for containing the contact-points. Figs. 3 and 4 illustrate a modification. Fig. 5 is a vertical transverse section of the lamp.

Referring t0 the figures, A represents the globe of the lamp. This is made with annular corrugations or rings a a covering the main portions of the lamp-globe. Preferably the end a is plain for the purpose of preventing the lamp from casting shadows downward. This globe is made by blowing the glass into 7: a mold the interior of which is corrugated or configured to correspond to the surface of the globe, and while the globe is being formed it is turned back and forth or continuously in one direction in the mold. This insures a smooth continuous surface, and at the same time the blowing of the glass will cause the walls of the globe to be of equal thickness throughout its entire surface.

In the present instance the lamp is shown as being constructed with its filament upon a separate part, B. This is inserted in the neck of the globe and secured in a manner well understood. The lower end of the neck is constructed with an outer screwthread, b, which serves as a convenient means for securing the lamp into a holder of suitable character-such, for instance, as is illustrated in a patent issued to me. This screw-thread is cast or formed upon the glass in any suitable manner. In Fig. 2 the contacbpoints c and o are shown as being supported upon a block, 0, preferably formed of glass or other suitable non-conducting material, which is inserted within the neck of the globe. Annular depressions or openings d and d are formed in the neck of the lamp and in the block for the purpose of re ceiving plaster-of-paris or cement, which serves to bind the block securely in position. The block 0 carries a contact-ring, c, which too serves as one of the contact-points, and one of the leading-in wires is connected with this ring, as shown at e, by means of a drop of solder or any other convenient manner. The

other leading-in wire passes through the center of a contact-block, c, which is received by a corresponding opening at the center of a block, 0. This opening may with advantage be square, and the lower end of the block a is TO also square to fit within it, being fastened, if necessary, with cement or plaster-0f-paris.

This method of fastening, however, may not be essential, because the leading-in wire may itself very well serve the purpose. In F1gs. 3 and 4. the block is shown as being provlded with a screw-thread which turns in an inner screw-thread, f, formed upon the inper surface of the neck of the lamp. In this lnstance the wires are preferably first brought together near the center of the block and twisted about each other, so that the block itself may be screwed into the neck without twisting the wires about themselves. This is conveniently accomplished by forming a slot, f in the block, and this slot may extendentirelythrough the block upon one side, so that the w1res may be centered. The slot serves as a niche for receiving the screw-driver.

I claim as my invention- 1. The combination, with an incandescent electric-lamp globe having a neck of glass integral with the globe and formed with an internal screwthread, of a contact-supporting block screwing into said thread, substantially as described.

2. A globe for incandescent electric lamps having a neck integral with the globe and having a screw thread for receiving a holder formed upon the outer surface of the neck.

3. In an incandescent electric lamp,the com- 4.0 bination, with the neck of thelamp, of a block entering the neck and secured therein, of the same material as the lamp, a central contactpoint sunk into the block, and an annular'contact-ring embracing the outeredge of theblock. 5

4. The combination, with an incandescent electric lamp, of a solid-glass block secured in the neck of the lamp and a central electrical contact-point sunk into said block.

5. In an incandescent electric lamp, the combination, with the neck of the lamp, of a contact-bearing block screwed into the neck,a slot in said block extending from the center to the outer edge of the same, and two contact-points carried by the block,substantiall y as described.

6. In an incandescent electric lamp, a neck provided with means of attachment to a sup port, a central contact-point having a perforation through its length, and a leading-in wire of the filament passing through said perforation and secured to the contact-point.

7. In an incandescent electric lamp,the com bination, with the globe, of a central contactpoint, a leading-in wire passing through the same, and an independent supporting-block of 65 glass surrounding the contact-point.

In testimony whereof I have hereunto subscribed my name this 28th day of December, A. D. 1886. 1

OTTO A. MOSES. 

